| 摘要 |
A perpendicular magnetic recording medium includes a nonmagnetic substrate; a first underlayer provided on the nonmagnetic substrate; a first nonmagnetic intermediate layer provided on the first underlayer; a second underlayer provided on the first nonmagnetic intermediate layer; a second nonmagnetic intermediate layer provided on the second underlayer; and a magnetic recording layer provided on the second nonmagnetic intermediate layer, wherein the first underlayer comprises a soft magnetic material which has a face-centered cubic structure and which includes at least Ni and Fe, and wherein the second underlayer comprises a soft magnetic material which has a face-centered cubic structure and which includes at least Co. The orientation dispersion is reduced and crystal grain diameters are smaller in the magnetic recording layer, and the film thickness of nonmagnetic intermediate layers can be decreased so that performance improvements such as reduced noise, increased S/N ratio, and improved write-ability are achieved.
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